Templates are embedded in the binary via go:embed directive and don't
need to be copied as external files. Removing COPY and ENV directives
for templates from Dockerfile and template file patterns from GoReleaser.
Changes:
- Remove COPY templates from Dockerfile (was failing: directory doesn't exist)
- Remove ENV GH_ACTION_README_TEMPLATE_PATH (never used in code)
- Remove template file patterns from GoReleaser archives
- Remove templates from GoReleaser extra_files
- Keep schemas (still used in config)
Fixes:
- Docker image builds now succeed
- No 'no files matched' warnings from GoReleaser
- Release workflow can complete successfully
- Binary uses embedded templates at runtime
